The paper length is not relevant since the chart flows from one page to the next.
Mobile
in.
mm
Portrait
2.75
70
For smart phones, not for printing
Landscape
5.5
140
For smart phones, not for printing
USA & Canada
in.
mm
Letter Portrait
8.5
216
Also Legal Portrait
Letter Landscape
11
279
Legal Landscape
14
356
Also Ledger Portrait
Ledger Landscape
17
432
International
in.
mm
A5 Portrait
5.82
148
A4 Portrait
8.25
210
Also A5 Landscape
A4 Landscape
11.71
297
Also A3 Landscape
A3 Landscape
16.54
420
The Text+ programs assume that the right and left margins are each about 25mm (1/2 inch) wide.
On the Format for Printing page, differences in page margins can be accommodated by the "fudge factor":
Henry PENNY
(1883 Western Australia, Australia - 30 Nov 1919 Greenhills, Western Australia, Australia)
Mabel Lillian JONES
(1881 Darlington, Durham, England - 2 May 1975 Greenhills, Western Australia, Australia)
└─Elfreda Margery PENNY
(9 May 1909 - 25 Oct 1993 Mount Hawthorn, Western Australia, Australia)
Thomas Robert HUGHES
(20 Apr 1902 Port Denison, Western Australia, Australia - 19 Jun 1943 Wooroloo, Western Australia, Australia)
├─Thomas David HUGHES
(13 Feb 1933 Nedlands, Western Australia, Australia - 15 Sep 2004 Perth, Western Australia, Australia)
1883 - 1919 (36 years)
Mabel Lillian JONES 
(1881 Darlington, Durham, England - 2 May 1975 Greenhills, Western Australia, Australia)